312729109 has 16 divisors (see below), whose sum is σ = 390551040. Its totient is φ = 243275760.

The previous prime is 312729103. The next prime is 312729119. The reversal of 312729109 is 901927213.

It is a happy number.

It is not a de Polignac number, because 312729109 - 2³ = 312729101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312729101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47662 + ... + 53824.

It is an arithmetic number, because the mean of its divisors is an integer number (24409440).

Almost surely, 2^312729109 is an apocalyptic number.

It is an amenable number.

312729109 is a deficient number, since it is larger than the sum of its proper divisors (77821931).

312729109 is a wasteful number, since it uses less digits than its factorization.

312729109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6840.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 312729109 is about 17684.1485234659. The cubic root of 312729109 is about 678.7702029718.

The spelling of 312729109 in words is "three hundred twelve million, seven hundred twenty-nine thousand, one hundred nine".